Vibratory unit



Nov. 19, 1929. w. D. PACK "'VIBRATORY UNIT Filed March 21, 1928 %/w ATT RNEYS right angles to the plane of vibration of said A sociated with the armature whereby loose and uncontrolled movements of the armature will Patented Nov. 19, 1929.

UNITED STA E OF WEHRLI D. PACK, OF SALT LAKE CITY, UTAH, ASSIGNOR TO UTAH RADIO PRODUCTS.

COMPANY, INCORPORATED, A CORPORATION OF UTAH macaroni UNIT Application filed March 21,1928, SeriaINo. 283,297.

nected to a diaphragm will produce soundconsequent to the variation of current in said.

coils mounted between the poles. 7

Another object of my invention is to pro duce a vibratory unit having means which will prevent distortion of the sound produced.

A further object of m invention is to produce a vibratory unit or a receiver which consists primarily of a novel way of transmitting the movement of the armature to a diaphragm or any other member that is to be vibrated; said armature being vibrated at diaphragm or other member to be vibrated.

A further object of my invention is to produce a vibratory unit in which the ends of the armature are left free withequal spacing be; tween the poles, of the magnet and the transmission of energy is made from its middle portion so that a perfect balance of the armature can be obtained.

A further object of the inventionrelates to the provision of suitable clamping means assitic sounds due to uncontrolled vibrations of the armature.

nation of elements and. arrangement of parts which will be exemplifiedin the opera tion and construction herein described in the .nection with the drawings, wherein similar following specification and illustrated in the accompanying drawings.

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof, but the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be understood from an illustrative, rather than a restrictive standpoint.

The invention will first be described in conreference characters are used to designate corresponding parts throughout the several views, and'more specifically defined and indicated in the appended claims.

Attention is directed to the drawings in which 1 Fig. 1 is a plan tory unit;

Fig. 2 isa central sectional view looking in the direction of the arrows 2-2 of Figure 1; Fig. 3 is a cross sectional view taken on the center line of the armature and looking in the direction of the arrows 33 of Fig. 1;

. Fig. 4 is a perspective view of the armature. assembly; and

'F'g. 5 is a front elevation of the armature assembly partly in section and looking-in the direction of the arrows 5-5 of Fig. 4, illustrating how the projecting member of the armature mountin to which the energy of the armature vibratlons is imparted, is corruview of my improved vibra- I gated to obtain stiffness and illustrates the r Numerall represents asoftiron armature to which is fastened the armature mounting 2 preferably made ofspring tempered phos-. phor bronze-and having the corrugated projecting member 2 integral therewith. Said armature mounting 2 is secured to the armature by electrical welding, hard soldering, or any other suitable means to accomplish the desired. results. The projecting member 2 is corrugated to give it stiffness so.that the energy imparted upon it by the armature will not distort it, which in turn would cause disor othermember to be vibrated through the medium of the connecting link 2. On either 'tortion of the sound produced by a diaphragm ture mounting side of the armature mounting 2, there is provided cushioning or damping members 2, preferably formed of rubber or slmilar resllient material adapted to control the freevibration of the armature 1 and to insure its faithful movement in response to variatlonin the impulses applied.

The magnetic coils 3-3 consist of fine wire wound upon spools, through the center of which the armature 2 passes. The poll pleces 4-4 and 5 -5 (Figures 1,2 and 3) are fastened to the permanent magnet 12 by means of the bolts 10 and the nuts 11, and are so shaped to have inwardly rojeeting fingers between which the ends of the armature are evenly spaced. The electrical impulses given the coils through their lead Wires 3 superpose' their magnetic forces upon the armature 1 and the pole pieces 4--4 and 5-5 connected to the permanent magnet 12 and due to the superposition of these forces the ends of the armature 1 are attracted or repulsed between the inwardly projecting fingers of the pole pieces causing it to vibrate. The vibration of the armature causes the armature mounting to flex at its center portion due to its being securely fastened at its ends to the mounting block 6 of non-magnetic material by means of the screws 7, which pass through the holes 17 provided therefor in said ends of the armaand screw into the threaded holes 18 in the bottom of the recess 15, as illustrated more clearly in Figure 3. The coils 33 are spaced apart on both sides of the armature mounting by means of the fins 14 and 14'. The damping members 2 are provided to retard the'free vibration of the moving system at any of its natural frequencies and thus insure faithful response to energization of the armature. The fins 14 and 14: of the mounting block are centralized around the armature by means of the circular portion 13, as illustrated in Figures 1 and 2. The mountin block is securely held in position by the b0 ts 8 and the nuts 9, the bolts passing through the holes 16 in said block. The bolts 8 also prevent the pole pieces from being turned from their normal positions and the inwardly projecting fingers of the pole pieces prevent the coils from outward movement by clamping them down tightly against the damping members 2 and 14 and 14.

In accordance with the provisions of the patent statutes, I have described my invention but I desire it understood that it is not confined to the particular form shown and described,-the same being merely illustrative, and that the invention can be carried out in other ways without departing from the spirit of my invention, and, therefore, I claim broadly the right to employ all equivalent. instrumentalities coming within the scope of the appended claims, and by means of which,

objects of my invention are attained and suitable holes in the pole pieces and pole pieces ailixed at the ends of said magnet. and an armature in which the ends thereof are free with equal spacing between the poles of the magnet in which the'transmission of energy is made from its middle portion so that a perfect balance of the armature is obtained, and means for damping the vibrations of said armature.

2. In a vibratory unit of the character described, the combination of a permanent magnet having pole pieces securely fastened thereto and extending inward, a mounting block securely fastened between the poles of said magnet and said pole pieces, a pair of coils mounted in said mounting block, and an armature assembly also securely fastened to said block consisting of an armature, cushioning means for said armature, a flexible mount- 1. A vibratory unit having a magnet, two

ing and a portion extending from the center magnet having pole pieces securely fastened thereto, said pole pieces being provided with projecting members, a mounting block securely fastened between the poles of said magnet and said pole pieces, a pair of coils mounted in said mounting. block, and an armature assembly also securely fastened to-said block consisting of an armature, a flexible mounting, damping means on either side of said mounting, and a portion extending from the center of the iarmature mounting at right angles to said armature to which the energy of the armature vibrations is imparted.

4:. A vibratory unit having a magnet, two pole pieces affixed to the ends of said magnet. and an armature in which the ends thereof are free with equal spacing between the poles of the magnet in which the transmission of energy is made from its middle portion so that a perfect balance of the armature is obtained, and means for damping the vibrations of-said armature, said damping means acting to space said armature from said pole of the magnet in which the transmission of energy is made from its middle portionso that a perfect balance of the armature is obtained, and means for damping the vibrations of said armature, said damping means acting to space said armature from said pole pieces and comprising resilient blocks.-

6. A vibratory unit having a magnet, two

pole pieces afiixed to the ends of said magnet,

and an armature in which the ends thereof are free with equal spacing between the poles of the magnet in which the transmission of energy is made from its middle portion so that a perfect balance of the armature is obtained, and means for damping the vibrations of said armature, said damping means acting to space said armature from said pole pieces and comprising resilient blocks and electrical coils surrounding said armature.

This specification signed this 23 day of February, 1928.

WEHRLI D. PACK. 

